Pale Corydalis at Huron National Wildlife RefugePhoto by USFWS. Original public domain image from Flickr https://www.rawpixel.com/image/4028668/photo-image-flower-plantFree Image from public domain licenseUnopened flower buds on a lemon tree. USDA photo by Prem Kumar. Original public domain image from Flickr https://www.rawpixel.com/image/3260016/free-photo-image-acanthaceae-blossom-budFree Image from public domain licenseCaulophyllum thalictroides 3, Blue Cohosh flower, Howard County, MD, Helen Lowe Metzman https://www.rawpixel.com/image/8756833/photo-image-flower-plant-public-domainFree Image from public domain license